War for the Overworld, a Dungeon Keeper inspired game from 2015 had a huge free upgrade recently bringing some graphical improvements and performance optimizations. Nice to see a developer come back to an older title.
The game for the most part is in maintenance mode but this was something of an experiment for a member of their team, and still quite impressive to just come out with years later. One of the major additions is the inclusion of real-time shadows, which dramatically improves the moody look of the game.
A few other shadow tweaks were added in, all of which seem to be optional as the more advanced features are quite a bit more taxing on computer resources of course.
On top of that it went through a visual tone overhaul, to give you more of a sense of being underground and they provided some comparison shots on that (click to enlarge):
Going even further, some performance optimizations also made their way into the game. The developer said they saw a "significant 41.8% reduction in UI overhead on the main menu" and a "5000% gain in performance" for certain parts of the in-game UI like the unit panel "taking only 0.1ms to render down from 5ms when fully populated".